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video_coding: Update to hybrid mode: Set FEC values for zero below a threshold.

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Review URL: http://webrtc-codereview.appspot.com/245001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@773 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
mikhal@webrtc.org 2011-10-19 15:48:30 +00:00
parent c693bac6e7
commit d0752c370d
2 changed files with 18 additions and 2 deletions
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18
src/modules/video_coding/main/source/media_opt_util.cc
View File

@ -76,10 +76,17 @@ VCMNackFecMethod::ProtectionFactor(const
// Compute the protection factors // Compute the protection factors
VCMFecMethod::ProtectionFactor(parameters); VCMFecMethod::ProtectionFactor(parameters);
if (parameters->rtt < kLowRttNackMs)
{
_protectionFactorD = 0;
_protectionFactorK = 0;
VCMFecMethod::UpdateProtectionFactorD(_protectionFactorD);
VCMFecMethod::UpdateProtectionFactorK(_protectionFactorK);
}
// When in Hybrid mode (RTT range), adjust FEC rates based on the // When in Hybrid mode (RTT range), adjust FEC rates based on the
// RTT (NACK effectiveness) - adjustment factor is in the range [0,1]. // RTT (NACK effectiveness) - adjustment factor is in the range [0,1].
if (parameters->rtt < kHighRttNackMs) else if (parameters->rtt < kHighRttNackMs)
{ {
// TODO(mikhal): Disabling adjustment temporarily. // TODO(mikhal): Disabling adjustment temporarily.
// WebRtc_UWord16 rttIndex = (WebRtc_UWord16) parameters->rtt; // WebRtc_UWord16 rttIndex = (WebRtc_UWord16) parameters->rtt;
@ -90,7 +97,7 @@ VCMNackFecMethod::ProtectionFactor(const
_protectionFactorD = static_cast<WebRtc_UWord8> _protectionFactorD = static_cast<WebRtc_UWord8>
(adjustRtt * (adjustRtt *
static_cast<float>(_protectionFactorD)); static_cast<float>(_protectionFactorD));
// update FEC rates after applyingadjustment softness parameter // update FEC rates after applying adjustment
VCMFecMethod::UpdateProtectionFactorD(_protectionFactorD); VCMFecMethod::UpdateProtectionFactorD(_protectionFactorD);
} }
@ -210,6 +217,13 @@ VCMFecMethod::UpdateProtectionFactorD(WebRtc_UWord8 protectionFactorD)
_protectionFactorD = protectionFactorD; _protectionFactorD = protectionFactorD;
} }
// Update FEC with protectionFactorK
void
VCMFecMethod::UpdateProtectionFactorK(WebRtc_UWord8 protectionFactorK)
{
_protectionFactorK = protectionFactorK;
}
// AvgRecoveryFEC: computes the residual packet loss (RPL) function. // AvgRecoveryFEC: computes the residual packet loss (RPL) function.
// This is the average recovery from the FEC, assuming random packet loss model. // This is the average recovery from the FEC, assuming random packet loss model.
// Computed off-line for a range of FEC code parameters and loss rates. // Computed off-line for a range of FEC code parameters and loss rates.

2
src/modules/video_coding/main/source/media_opt_util.h
View File

@ -187,6 +187,8 @@ public:
float AvgRecoveryFEC(const VCMProtectionParameters* parameters) const; float AvgRecoveryFEC(const VCMProtectionParameters* parameters) const;
// Update FEC with protectionFactorD // Update FEC with protectionFactorD
void UpdateProtectionFactorD(WebRtc_UWord8 protectionFactorD); void UpdateProtectionFactorD(WebRtc_UWord8 protectionFactorD);
// Update FEC with protectionFactorK
void UpdateProtectionFactorK(WebRtc_UWord8 protectionFactorK);
}; };